Oops, it doesn't look like 'bring a friend day' is a national day..

Other days

blanket fort

Blanket Fort Day
mean girls

Mean Girls Day
cat girl

Cat Girl Day
first love

First Love Day
ponytail

Ponytail Day
nae nae

Nae Nae Day
tulip

Tulip Day
youth

Youth Day
one

One Day
gum

Gum Day